Apparatus for feeding continuous-working wood grinders and method thereof



July 30, 1929. w. RABUS APPARATUS FOR FEEDING CONTINUOUS WORKING WOODGRINDERS AND METHOD THEREOF Filed Sept. 3,- 1924 2 Sheets-Sheet l n iiiATTORNEY.

y W. RABUS APPARATUS FOR FEEDING CONTINUOUS WORKING July 30, 1929.

WOOD GRINDERS AND METHOD THEREOF 2 Sheets-Sheet 2 Filed Sept. 3, 1924 INVENTOR ATTORNEY Patented July 30, 1929.

STATES PATENT orric WILI-IELM RABUS, or HEIDENI-IEIM-ONTHE-BRENZ,GERMANY, ASSIGNOR o R; CAN VOI'IH CONTACT COMPANY, INC., on NEW YORK,Y., A CORPORATION on NEW YORK.

APPARATUS FOR FEEDING CONTINUOUS-WORKIN G WOOD GRINDERS AND METHODTHEREOF. I

Application filed September 3, 1924, Serial No. 735,552, and in GermanySeptember 16, 1923.

This invention relates to apparatus for feeding continuous working woodgrinders of the type generally known as magazine grinders, and has forits object to provide an improved apparatus in which the charge issubjected to pressure in the immediate proximity of the grindstone, andat the same time that portion of the charge is caused to be compressedto a greater degree than in the remaining portions of the magazine orhopper, in which the charge is moved stoneward.

The invention has for its object to provide improvements over thestructures and methods disclosed in my co-pending application Serial No.720,422., filed by me in the U. S. Patent Office on June 14:, 1924;,Patent No. 1,532,946-for an apparatus for feeding continuous workingwood grinders and methods thereof. In that application the inventiontherein claimed consists, among other things, of the arrangement oftoothed wheels entering into the magazine or hopper in proximity to thegrindstone, the teeth or projections of said wheels serving to move thewood toward the grindstone at the same time that a special compressionof the charge in proximity to the grindstone is obtained. Thepresentinvcntion comprises members entering into the magazine inproximity to the grind-stone and providing such members with gapstherebe-v tween for collecting therein the logs of the charge, theso-collected logs-being guided in said gaps between said memhersand themembers themselves serving to press the logs directly against thegrindstone. Such members may be arranged in different ways and modi fiedwithin the spirit of my invention, and various embodiments thereof areshown and described hereinafter.

The invention will be more fully shown in the accompanying drawings andhereinafter described, and finally pointed out in the claims.

In the accompanying drawings,- Figure l is a vertical central section ofa well-known magazine grinder to which is api plied one embodiment of myinvention;

Figure 2 is a similar section to which is applied another embodiment ofmy invention,

Figure 3 is a partial. detail view of still another embodiment of myinvention,

Fig. 4 is a vertical central section of the magazine grinder shown inFig. 1 with parts thereof in a changed relation, and

F 1g. 5 is a similar section to that shown in Fig. 4 of theembodimentdisclosed in Fig. 2. Similar characters of reference indicatecorresponding iarts throughout the various views.

Referring to the drawings, and more par-. ticularly to Fig. 1, the wellknown magazine grinder containing a charge is therein shown, beingindicated by C. Along the walls of this magazine at the lower portionthereof and in proximity to the grindstone B openings F are providedinto which openings preferably at both sides of the magazine, members Aintrude. These members A are in the nature of Wheels rotating on shaftsA. Along the periphery of said rotating members A, separating members Gare provided, between which members G gaps H are formed. The members Gare inclined to the radii of the rotary members A and walls T connectthe members G, these walls T being preferably curved in shape. Thedisposition of the members G and the gaps H and the Walls T are suchthat when these members enter into the magazine to their fullest extent,the walls T are in substantial alignment with the inner surface 0 of themagazine. The members G are so disposed in respect to the rotarysupporting members A that the gaps H are presented in their openposition to the charge of the grindstone asthe members G approach thegrindstone and by reason of this, certain logs of the charge in themagazine drop into the gaps H. In Figure 1 these certain logsareindicated by the character L. The limitation imposed upon theposition of these logs L that so enter the gaps H, is the inside surface0 of the magazine C. As the members A rotate they serve to carry withthem the entrained or captivated logs and as the members G pass out ofthe opening F in the walls of the magazine C, the walls of the magazineserve to prevent the logs from following the movement of the members Gand the gaps H therebetween and the members G serve to press the logs Ldownwardly against the grindstone, at the same timecompressing theadjacent logs or the logs intermediate the logs pressed by the members Gand those in direct contact with the grindtween each pair a sharp angledgap which is preferably rounded at its bottom, is arranged in a mannerspecially adapted to the collecting and guiding of the logs as they fallinto such gaps from above. As these pressure plates G continue to enterinto the magazine, they proximate more and more the horizontal,

and by this serve, in this manner, to subject the logs under suchpressure plates to pressure and press and compress them against thegrindstone B. hen such pressure plates come nearest to the grindstonethey again are withdrawn out of the charge.

In the embodiment shown in Figure 2, instead of having the pressureplates firmly secured to the wheel as in Figure 1, these pressure platesmay be suitably linked to the wheel and also provided with springactuated means to give a certain flexibility of movement thereto. Forthis purpose, the pressure plates G are pivoted at G to the wheel andbetween the wheel and the pressure plates G suitable springs e arearranged. The peripheral portion of the wheel itself is provided withabutment portions 6 on the wheel E which enter somewhat into theinterior of the magazine, and serve at the same time to prevent the logsfrom coming in direct contact with the springs. Suitable mechanicaldevices as covering plates for the springs can, of course, be arrangedand preferably, of course, these springs are of such a character thatthey prevent too much of a movement of the pressure plates G away' fromthe periphery of the wheel E, though here also suitable mechanism may beprovided to limit the movement of the plates G In the drawings, suchmeans are shown in that the rear end of the pressure plates G abutagainst the abutment 6 whereby their movement is limited. Again betweenthe pressure plates G the gaps or pockets y, H are formed which receivethe logs as'they enter into the magazine and convey them by the logsresting on one side of said pressure plates, and press the logsdownwardly against the grindstone by the other side of the pres surelates exertin a com )I6SSlI1 action on C3 the logs in the direction ofthe grindstone. The relative movement of these pivoted pres sure membersG particularly when under spring tension, gives a certain flexibility ofmovement thereto. The shafts A and E of the embodiments shown in Figures1 and 2, may be suitably adjusted by means of screw spindles 0 In Figure3 I have shown another embodiment of the pressure plates correspondingclosely to the paddle wheels of paddle steamers and it is of course,clear that these pressure plates may be arranged with any suitablemechanical, hydraulic, pneumatic or electrical steering device whichwould adjust and regulate the position of the pressure plates in theirpath from the entrance into the magazine to their exit therefrom. v

Preferably, as shown in Figs. 4 and 5, the pressure plate wheels are soarranged in re spect to the charge on the grindstone, that they aredisposed in respect to each other, in a manner that the end of onepressure plate on one wheel is in line with the gap between two pressureplates on the other wheel. The construction of the two members isthe'same as those shown in Figs. 1 and 2, but the wheels A and wheels Eare turned with respect to each other as just stated. This arrangementhas certain advantages in that greater flexibility results since thedirect horizontal pressure resulting from two pressure plates being onthe same horizontal line is thereby avoided and a corresponding janrming is obviated, with the result that the logs can more readily fallinto the pockets or gaps.

Among the advantages of the described arrangements in respect to theprior devices, is that in consequence of the continual change ofposition of the pressure plates in respect to the charge of the logsthereof, the pressure plates on the one hand permit the drop ping of thelogs of the charge into the gaps or pockets formed between the pressure100 plates, and that'taken on the other hand in the course of theircontinual progressive movement corresponding to the revolution of thewheels, positions particularly advantageous in that they provide arelatively lat- 105 eral as well as a downwardly directed compression ofthe charge in the proximity of the grindstone and in the directiontowards the grinding surfaces of the grindstone. At the same time theexit of the pressure plates out of the charge of the magazine in veryclose proximity to the grindstone takesplace essentially in thedirection of their own surfaces so that by their exit the least amountof resistance is encountered during their 115 withdrawal. The withdrawalof the. pressure plates in the line of their own surfaces may thereby,be readily accomplished without subjecting the discharge to anydisturbing influences.

A further advantage of the embodiments described and particularly sowhen the pressure plates are pivoted or hinged, is that within certainlimits, the pressure plates may adapt themselves to the particular 125shapes of the individual logs comprising the charge, these logs, as iswell known, having different shapes and dimensions. l/Vhen the pressureplates are arranged so that the pres-' sure plates of the oppositewheels are staggered to each other, afurthcr advantage is presented inthis that the downward pro duced resulting pressures from thealternating downward left movement and downward right movement, veryfavorably influence a tight and closed position of the individual logsdirectly over the grindstone.

It will also be noted that the pressure members on the rotarymen'lbersextend only partially within the charge, that is, they do not extendbeyond the median line thereof, and preferably such rotary membersengage only the lateral sides of the .charge at oppositesides thereof.

The improved method consists in separating certain logs of the chargeduring their movement toward the grindstone and then subjecting theseparated logs to a special downward or stoneward pressure and theimproved method consists further in subjecting a charge of a magazinegrinder alternately to the right and to the left of laterally inward andstoneward pressures.

I have described several embodiments 0t my invention and have shown themin the accompanying drawings, and have also de scribed a method for thegrinding of logs, but I do not wish to be limited to the detailsthereof, as do not enter into the spirit of my invention as defined inthe following claims.

What I claim as new is:

1. Apparatus for feeding wood grinders comprising a magazine forreceiving a charge of logs, a grindstone cooperating with said magazine,and means for compressing the wood charge directly toward thegrindstone, said means comprising rotary members having pressure platesextending tangentially outward therefrom entering into and passing intothe magazine under rotary movement for collecting certain logs of thecharge between successive plates and pressing them, toward thegrindstone, said pressure member entering beyond the lateral side of themagazine and into the charge and within the median line of the chargeand such pressure means further keeping the charge away from themagazine walls so as to avoid friction between the charge and the walls.

2. Apparatus for feeding wood grinders comprising a magazine forreceiving a charge of logs, a grindstone cooperating with the magazine,and means for compressing the wood charge directly toward thegrindstone, said means comprising rotary members having pressure platesextending tangentially outward therefrom forming pockets therebetween,entering into and passing into the magazine under rotary movementforcollecting certain logs of the charge between successive plates andpressing them toward the grindstone, said pressure means entering beyondthe lateral side of'the magazine and into the charge and within themedian line of the charge and such'pressure means further keeping thecharge away from the magazine walls so as to avoid friction between thecharge and the walls.

3. Apparatus for feeding wood grinders comprising a magazine to receiveacharge of logs, a grindstonc to cooperate with the magazine, and meansfor compressing the wood chargedirectly toward the grindstone, saidmeans comprising rotary members having pressure plates extendingtangentially outward therefrom forming pockets therebetween, enteringinto and passing into the magazine under rotary i novement forcollecting certain logs of the charge and pressingthem toward thegrindstone, the said pliessure plates and pockets being so disposed thatthey first enter into and as they pass through the magazine arewithdrawn. from the logs,

said pressure member entering beyond the between, entering into andpassing through the magazine under rotary movement for collectingcertain logs of the charge and pressing them toward. the grmdstone, the,said pressure members and pockets being so disposed that they firstenter into and as they pass into the magazine are withdrawn'from thelogs and plates and being so disposed that they take substantiallyhorizontal position as they withdraw from the charge of the magazine. I

Apparatus for feeding wood grinders comprising a magazine to receive acharge of logs, a grindstone to cooperate with the magazine, and meansfor compressing the wood charge directly toward the grindstone, saidmeans comprising rotary members having pressure plates extendingtangentially outward therefrom, entering into and passing into themagazine under rotary movement for collecting certain logs of the chargeand pressing them toward the grindstone. said plates entering only thelateral sides of the charge at opposite sides thereof, without extendingbeyond the median line thereof, said means a-itter having entered thewalls of the magazine gradually being projected more and more into thecharge up to a maximum projection thereafter being gradually withdrawnas the charge approaches the stone.

6. An apparatus for feeding continuous Lil Working wood grinders whichconsists of a hopper or magazine having lateral'openings, rotary membersone at each of two opposite sides of the magazine or hopper,pressureplates arranged tangentially on said rotary members forming gapsor pockets therebetween, the opposite rotary members being so disposedthat one pressure plate of one rotary member is aligned with the gap orpocket between two pressure plates of the opposite rotary member.

7 An apparatus for feeding continuous working wood grinders whichconsists of ahopper or magazine having lateral openings, rotary membersone at each of two opposite sides of the magazine or hopper, pivotedpressure plates on said rotary members forming gaps or pocketstherebetween, the opposite rotary members being so disposed that onepressure plate of one rotary member is aligned with the'gap or pocketbetween two pressure plates of the opposite rotary mem ber.

8. An apparatus for feeding continuous working wood grinders whichconsists of a hopper or magazlne having lateral openings,

rotary members one at each of two opposite sides ofthe magazine orhopper, pivoted and spring actuated pressure plates on said rotarymembers forming gaps or pockets therebetween, the opposite rotarymembers being so disposed that one pressure plate of one rotary memberis aligned with the gap or pocket between two pressure plates of theopposite rotary member.

10. Steps in the method of grinding materials, consisting incontinuously feeding the materials downwardly as a column against theedge of a rotating grindstone, and alternately imposing pressure on theopposite sides of'the column adjacent the grindstone on lines oblique tothe direction of movement of the column and toward the central portionof the operative zone of the grindstone periphery.

11. Apparatus for feeding wood grinders comprising a magazine and agrindstone to cooperate therewith, and means for compressing a charge oflogs in said magazine towards the grindstone, said means comprisingrotary members carrying pressure members on their peripheries to enterthe magazine from opposite sides and collect the logs adjacent thegrindstone to press them towards the latter; said rotary members beingso disposed that the pressure members thereon enter the mass of saidlogs and force them away from the sides of the magazine adjacent thegrindstone.

12. The method of grinding materials which consists in confiningmaterials and in feeding them under the action of a force against amoving abrading member, and as said materials pass towards saidmembersubjecting the mass thereof to pressure from opposite sides tocompress the materials into a mass and towards the abrading member.

13. The method of grinding materials which consists in confining saidmaterials and subjecting them to the action of a force to carry them ina mass against a movable abrading member and as the materials movetowards the said member subjecting them to the action of pressure inwardof the said mass and towards the said member alternately from oppositesides of said mass.

In testimony that I claim the foregoing as my invention, I have signedmy name hereto.

WILHELM RABUS.

